Fitting for electrical conduits



Nov. 11, 1930. K. SIXMA I 1,781,199

FITTING FOR ELECTRICAL CQNDUITS Filed May 7, 1926 2 Sheets-Sheet l INVENTOR V/am MW if 'ToRNEYj Nov, 11, 1930. K. SIXMA 1,781,199

FITTING FOR ELECTRICAL CONDUITS Filed May 7, 1926 2 Sheets-Sheet 2 INVENTOR )(M www RNEY l Patented Nov. 11, 1930 Y y i .Unirse if rares Para Kriens siXMa, or MONTGLAIR, NEW JERSEY Finir-inercia.' Vallucinazioni. coNDUrrfs Application med May 7, 192e.. serial No. 10?;314.

Thisinvention relates to fittings and especially` to fittings for electrical conduits through which` insulated wires arepassed.

The principal object of this invention is to providea means Jfor conveniently attaching a fitting to the ends ofconduits regardless-of whether those conduits Vare provided .with threaded ends orinot. n y

A further object of the invention-is to pro- ,l iodide d fitting which may be, .divided on a,

center line and the two halves bel exactly alike, .so that the different kinds of parts to be kept in stock will be minimized.

Other objects and advantages of the 1nvention will appear as the description of the y.t0,illustrate the, invention, reference is had` to the accompanying drawings, whereinfI ,have illustratedparticular preferred physi-r cal embodiments of my invention, and wherein like characters of reference designate correspondingv parts throughout the several viewsand in which: r

Figure 1 is a view partly in plan andfpart- Y ly in section showing one form of'my improved i'itting, and the means for connecting the same to a conduit. Fig. 2, is .across sectional viewtaken on the plane indicated by the line II-.IL Fig' l, viewed in the'direction of the arrows at the ends of the line; 3, isa detail longitudinal sectional view indicating the construction of ythe connecting mea-nsfor the tting; Figli, is a cross sectional 'viewl on the plane indicated by the vline 40 IV-IV of Fig. 3, viewed in' the direction of vthe arrows at the ends of the line Fig. 5, is a longitudinal sectional detail View of a Ymodiiication of the device as shown infFig. 3; Figc, is a cross sectional View on the plane indicated by the line Vl-VI vof Fig. 5, viewed in the direction, oil the arrows at the i 'ends' of the line; Fig.`7, isa longitudinal sectional view ot a modified form of the means as shown in Fig. 3'; Fig. 8, is a cross sectional view of another modified form; Fig. 9 is a view partly in plan and partly inl section,

plicantsinvention; Fig. 10, is an end View of the device Fig.f9; Figrll, is a longitudinal sectional View 'indicating a method o connectinga conduittowhat is known as a wall y box; Fig. l12, is .a'view' illustrating how the partis' of a two part fitting'may be made identica. i i l' In Fig. 1, l have shown aconduit-l, a con! duit- 2 and a conduit 3 and in addition a fitting designated generally by F, which connects the conduits. r

The iitting F, for convenience, lshould be madein two duplicate'parts and iny general lis a hollow elongated' lprism with reduced showing aform of coupling embodying` apends yand should be so. constructed that access vmay be had-tothe interior thereof Without disturbing the position of the conduits 1, 2

and 3. It is common to make and use Va itting which may connectV two, three or four conduits and lwhichis so constructed that access may be had to theinterior thereof without disturbing the position of the conduits. These prior artfittings'are however,V '"1 in general', composed of two parts held together by nuts and bolts. There are fittings such las those shown in lmy prior patents as No. 1,108,259, dated August 25, 1914,-an'd No.

(1,229,665, dated, .l une 12,1917 in which the @j construction Lis such that bolts and nuts are l.not used,-but tliisprior` construction of minev f of which the present invention isan improvef ment, in some forms necessitates an extral Vlong thread upon theconduit. in thepresent invention, thethread required upon the contypes of fittingsrand in addition, there is provided fin the present invention a means whereby a thread may be made upon *theV conduit by means ofonef'of theiparts of the iitting. f

annular member. `rhis bushing is provi-ded with aninternalthread. designated 'f5 which C will. interit with the threads 6 of a conduit V as 1, so thatthe vbushing may be screwed onlduit is no longer. than is usualwith other 4 designates lwhat l will term al bushing or n preferably Amake the threads 5 of vfie r the'threads 6 of thevconduit l if that-*conduit Lisforrned VWith'what'is known as thread forfits diameter."v Y Y AThe bushing 4as shown by Figs. V3 andn- Y. is formed with a plurality ofA ont outpon tions 7., "These cut out portions are prefer-y A' Vij ably somewhateqnallyspacedandaresepaf ratedl by segmentsorportions as 8 which are I *substantially of aproper Y,internal boreft-o- Properly when 'PIV'GV ,arjthralz QI?? gage kwith `a ,thread as i'npon aparticnlar i :conduit as l. Ifa conduit .as `lV-:is threaded 'on the end, then bushing4' maybe directly 54,'so that'the threadsof Vthe bushing and 1 the 'conduit tightly and.practically eonipletef to prevent-water entering.

i v`ly vinterfit vfor atleast a `short distance'so V,as

In' order that thebushing willproperly pof sition itself when being screwed onto an unthreaded conduit,thethrea'dsjin the bush- .ing' are carried onlyto theiline46'Fig33- Beyond this pointA the" interna-l Vborel ofthe bushings is rthe "same as the; diameter ofthe ipipe, so .that'a centering surface y47` forinfed f l i.; im.

f in the'bnshing.4 Vi Y Y After bushings as 4 'are'placed on the ends the fitting-f VBy nieans of these *coacting yshoulders vall parts .arej held 'in perfect alignir mentand rigidly,inposition'.l y

f VIiiorden Vtocoinplete'thefstructnrafa locl` f nut? orclamping ringorannnlus:13 is screwed y onto'thefitting,olainpingthe two partsofthe ttingitogetlier and finv place incontaet "with,k the shoulders on thebushing.`vv This clalnnp'fv fingV yring has an external periphery" in 'such Q formlth'atY an ordinary-y wrench may bey app'lie'dtheretopreferably having flat faces but V"not necessarilyso.YV In. thefforrn shown, it is Y y y octagon'al. `The-inner snrfacefofthe annnlus y is r:fofrrn'e'd with a bearinglor centering surface: :'114f`fwhichineets with and 'bears iiponthe bearing o'rcentering surface 15 lof the bush-A .t ingsv thereby exactly centering .the annulus'.

"Iprefera'bly Vcclnnstr'nctfthe -fittingF, and I the ,annnlus- 13 /Withfr (jo-Aoperating` tapered threads of what is known as the double form, that is, there are reallyl two independent- 'threads or helices formedon vboth the fitting the annulus.

' Fig. 12is a .development ofthe threaded similar ends ofan upper and 'lower part v of a standard Y i -Thexuppe'r part ofthe fitting isjrepre'sented Y by to A18, bnt the line 56 is the sanne part-Q f ing line as'shown by 55, and 18'designatesV the other .parting line: Itjwill be' seen, therefore,

a fitting.Ll The lowervpart of the fittings is v l representedby the portion from718ito Q55'.

that thread i7 proeeedsft'o 48 then tracing the startsat 50andproeeeds to land thenstartvicfejversa; f Suchga `construction vdecreases `ing ifrom/thesa'mepoint 5l at the left of the=" f viewj orooeedsto,52. `rBy this expedientboth, Y the npperand the flower half )of ,av fitting .i t inayf be used.l interchangeablyg j That is the Y Lipper portion may be sed for the lower Vand k3e i l @est of @negate l1ii1u1hnn3g1- Dinan-S to be kept in,V i sto'olr and'obviateslossof tirnel in `I'natc'hing y Y rately positioned, blit'theisho'ulders i9 and l() n'of bnshingl4 yare dispensed with, their equiva hold'the fitting in'place'. 'T

' In' Fig. v8,1 have shown still? another type. l Lr ThejbnshingSOjis' formed with yav portion 31,.

.of adiameter proper forentering va conduit" V andjhasfforined on the exterior surfaceVv the thread 32 "which engages with va i thread' Y `forncud on V'the inside of the conduit or .ini jbeingtscrewedf in` forms such `thI-jeadffv The' t bushing also 1has'anexternal threadA 33 which'.v feo-operates with'a thread on the interior- Otan .'annulns. 34jfor1ned likel the "annulus' 27 of lFig. 7f and rco-operating' with the ffittingfllzin 'thesaine'way {Inthe `forno shown inFig. 8, v however, thelongitudinal positioning ofthe "upper and'lowerhalves( Totak'eyflladvanthread thef-annnliis Ifoutletsffronrthe"fitting aredesiredthen 'split or twholeinsulatingbushings as'"'19",Fig. t '2,"rnay 'be nsed'orbnshings as 20, held iny place l l f Spring wire 251i y of the YeonstriictionL1as,shownjby L ".ligs.` lto 4 inclusive,I maybnildmy-bushing i f 22 as, shown inFig. 5,that is, a groove v23 is Y formed inthefbushing and an-annularrib 24 may be formedlon the ittingF tolie insueh groovef.` Bythis means the'fitting .is accu?l f lent being presentin theshoulders ferinediby`4 t* .the groove."V 'V- 1' "'f Y Y of each of the Vcon-dnitsas l, yZand 3, theiity..

- "ting, proper .'F Inlay be pnt inpl'a'ce,being positionedfaecnrately by"` the ooacting` spacedv facing shonlders 9 and l() *on the' bushingy wi'tli the Shoulders 1l 'and' V12 respectivelyof as 2e corresponding in fiinotion` to ont away pOrtOnS Tof Fig# 4- In Fie-- 6; liiieverfthe material isi-removed to 'andthrongh the snr-` .e :face ofthe bnshingso that chipsjfallthere-f l[through.andfaway from the finished con?y 'struction- This constriiction may ofcourse be used either with bushing 22AM-bushing 4. v e f Y" InyjFigz 7,17'have'shownv still anotherfcon- Y f lsf'rutoiln that the fitting Flproper'has 'n0 .thread thereon. .The bushing-Mis provided Y' ,-j vwithani-external,thread'26ceoperate With-l l. anpinternalthread onftlie annnlu's. 27gand :the p sloping snrfaoesQSfand 2901iV thev annnln's 27,* yand the Vfitting VvE.resp'e'ctively, togetherlwith" the co- )perating'shonlders29 Vand 30, securely` K Y f not carried quite to the end of the coupling. YBetween 37 and 38 the centering faces 39 are formed. The couplings are provided with the chip receiving spaces 40 just as in the bushing 4, Fig. 1, or it may be constructed like the bushing 22 with'cut kthrough portions 25. Y Y

In Fig. 11, I have illustrated the application of my bushing to the yconnection of a threaded or unthreaded conduit to a box. The wall of the box is designated 41. The

`bushing 42 has a shoulder 43 which abuts one side of the wall 41 of the'box.A The bushing 42 also has a threaded extension .44 extending into the box and on this threaded extension works a clamping nut 45 which clampsr against the inside of the wall of the box.

Applicant contemplates so constructing the fittings and bushings that one fitting maybe applicable for use with several different size conduits. This resultis attained by making the external dimensions .of'several bushings the same, but the internal dimensions different Vso that a particular size conduit will be tted. Applicant may in this way use, say,

one fitting for three or more dierent sizeV conduits as, say, l/gQL. and 1 by using the proper one of three dierent bushings.v Applicants invention lends itself readily to such procedure and results in a great saving in the number of parts whichvmust be kept in stock. It is of course to be understood that in those cases where the bushing is to be used to form a thread, the bushing will be given the most advantageous form and be made of material, preferably, such as steel hardened and tempered, to suit the work which it has to perform. y

Although I have particularly described the construction of several physical embodiments of my invention and explainedthe operation and principle thereof, nevertheless, I desire to have it understood that the formsselected are merely illustrative but, do not exhaust the possible physical embodiments of the idea of means underlying my invention.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. A bushing of general annular shape formed internally with a thread and having cut away portions transverse to the thread for receiving chips and a centering surface at the outer end thereof for bearing on a conduit and externally with means for receiving and positioning a fitting and a centering sur- Y face for an annulus adapted to extend over said fitting. f

2. As an article of manufacture, as a wire conduit connecting means a device of general annular shape formed internally with a thread interrupted by symmetrically` ary ranged longitudinal cut away chip receiving spaces and a centering-surfaceat the outer end thereof adapted to engage the periphery of a conduit,l and externally withk a plurality of spaced facingshoulders and a centering surface for a clamping annulus.

KLAAS lee' ico

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